Tissue culture flask



FIG. 1 is a top and front perspective view of the tissue culture flask;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a back elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design a tissue culture flask, as shown. 